Where does “fluctuandus” come from?

fluctuandus (Latin) comes from Latin fluctuō, from Latin fluctus, from Latin fluō, from Proto-Indo-European bʰléh₁-, from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.

Definitions

Ancestry of “fluctuandus”, step by step

Step	Language	Word	Meaning
1	Latin	fluctuō	to surge, swell, undulate
2	Latin	fluctus	a wave, billow
3	Latin	fluō	to flow, stream, pour
4	Proto-Indo-European	bʰléh₁-	to bleat
5	Proto-Indo-European	bʰel-	to sound; to speak, roar, bark; shiny, white; to...
6	Proto-Indo-European	bʰōl-	—

Every word from Proto-Indo-European bʰōl- →Every word from Proto-Indo-European bʰel- →Every word from Proto-Indo-European bʰléh₁- →